CVE-2025-4341
📋 TL;DR
This critical vulnerability in D-Link DIR-880L routers allows remote attackers to execute arbitrary commands by manipulating HTTP headers. The command injection vulnerability affects the Request Header Handler component and can be exploited without authentication. Only unsupported D-Link DIR-880L routers are affected.
💻 Affected Systems
- D-Link DIR-880L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Router takeover enabling traffic interception, DNS hijacking, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact if device is isolated behind firewalls with strict egress filtering and network segmentation.
🎯 Exploit Status
Public exploit code available on GitHub. Remote exploitation requires no authentication. Simple HTTP request manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None - product is end-of-life
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. D-Link has ended support for DIR-880L. Replace with supported hardware.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers behind firewalls with strict inbound filtering
Disable Remote Management
allTurn off WAN-side administration access if enabled
🧯 If You Can't Patch
- Immediately replace affected routers with supported models
- Segment affected devices in isolated VLANs with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1. If version is 104WWb01 or earlier, device is vulnerable.Check Version:
curl -s http://192.168.0.1/ | grep -i firmware || ssh admin@router 'cat /etc/version'Verify Fix Applied:
Cannot verify fix as no patch exists. Only verification is hardware replacement.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to /htdocs/ssdpcgi with manipulated ST, REMOTE_ADDR, REMOTE_PORT, or SERVER_ID headers
- Unexpected command execution in system logs
Network Indicators:
- HTTP requests to router with unusual header values
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (uri="/htdocs/ssdpcgi" AND (header="HTTP_ST" OR header="REMOTE_ADDR" OR header="REMOTE_PORT" OR header="SERVER_ID"))